Metering valve for a carburetor



1956 J. E. BAKER METERING VALVE FOR A CARBURETOR 2 Sheets-Sheet 1 FiledNov. 19, 1954 FIG. 1..

INVENTOR JAIME-S E. 52552,

ATTORNEYS yzawazq'pmm Dec. 25, 1956 J. E. BAKER 2,775,437

METERING VALVE FOR A CARBURETOR Filed Nov. 19, 1954 2 Sheets-Sheet 2FIG. 2.

mvamox JAMES 5. 5455.9,

BY zgy/mpmm A9 ATTORNEY5 United tate This invention relates to ametering valve for a carburetor and has for its primary objecttoregulate the flow of fuel toan engine and to effect economies inengine operation. i

Another object is to prevent an oversupply of fuel to air entering themixing chamber of a conventional carburetor andto. exactly proportionthe supply of .fuel

to the air entering the mixing chamber in accordance with the velocitythereof. j I Still another object is to mechanically. alter the positionof a fuel supply'valve in response to the increasing or decreasingvelocity of air entering a carburetor throat on its way to the mixingchamber of the carburetor.

The above and other objects may be attained by employing this inventionwhich embodies among its features a valve mounted in the air intakepassage of a conventional carburetor adjacent the fuel intake portthereof, acounterbalance mounted within the mixing chamber andoperatively connected to 'the valve for advancing it into closingrelation to the: port,' and means mounted in the air intake passage ofthecarburetor and operatively connected to thelvalveformoving said valveagainst the effort of the counterbalance in response to increasingvelocity of air passing through said intake passage toward themixingchamber of the carburetor".

Other features include yielding rneans carried by the carburetor andengaging the valve for holding said valve against the effort of thecounterbalance, and said counterbalance \being responsive to increasingvelocity of the mixture passing through 'the mixing chamber of the ice .2 Figure 1 is a vertical sectional view through a carburetor embodyingthe features of this invention;

Figure 2 is an enlarged longitudinal sectional view taken substantiallyalong the line 2-2 of Figure l; t

Figure 3 is a greatly enlarged detailed fragentary view of the fuelinlet port and valve taken substantially on the line 3-3 of Figure 2; I

Figure 4 is a horizontal sectional view taken substantiallyxalong theline 44 of Figure 1, showing the parts greatly enlarged;

Figure 5 is a horizontal sectional view taken substantially on the line55 of Figure 3; and

Figure 6 is a horizontal sectional View taken substantially on the line66 of Figure 3.

Referring to the drawings in detail, acarburetor designated generally 10is equipped with a conventional float chamber 12 and float valve 14which regulates the level of the liquid fuel entering the float chamber12. Carried by the carburetor and extending upwardly and outwardlytherefrom is a duct 16 having a liquid fuel discharge port 18 adjacentits end remote from the float chamber 12, the discharge end of said portbeing located above'the level of the fuel in the float chamber 12 andhaving a conically shaped valve seat 28 at its discharge end. Thedischarge port 18 islocated within an air intake passage 30 whichcommunicates with a mixing chamher 32 which is disposed on the side ofthe port- 18 remote from the air intake passage 30. The structure so fardefined is conventional and forms no part of this invention except incombination therewith.

Extending transversely across the mixing chamber 32 below the port 18 isa rock shaft 34 on which a lever 36 is mounted intermediate its ends tomove about an axis which extends across the mixing chamber 32 adjacentits junction with the air intake passage 30 and I to one side ofthelongitudinal axes of the passage and carburetor for moving .the valveagainst, the effort of the yielding means, an air foil mounted in theair passage to move therein toward andaway from the mixing chamber andoperatlvely connected to the valve for moving said valve in responseto'increasing velocity .of

air passing through the air passage. 7 h t Other features include aliquid fuel duct having a liquid fuel discharge port openingtherethrough adjacent one end thereof, said duct having an annulargroove opening therethrough in concentric spaced relation to the port,an annular guide flange mounted in said groove to move longitudinallythereof, a cone-shaped valve-body carried by the guide flange formovement therewith toward and away from said port, said valve bodyhaving a liquid fuel discharge passage extending, therethrough,

yielding means carried by the duct and engaging said 7 valve body formoving it into open position relative to the port, a counterbalancemounted adjacent one side of the liquid fuel duct and operativelyconnected to the valve body for advancing it toward the duct'against theelfort of the yielding means, and an air foil mounted adjacent the sideof the duct remote from the counterbalance and operatively connected tothe valve for moving said valve in response to increasing velocity ofair passing said air foil, and said valve body having air passagesextending therethrough.

In the drawings:

chamber. A counterbalance 38 which also defines an air foil is carriedby the lever 36 adjacent the end thereof remote from the longitudinalaxis of the passage 30 and mixing chamber 32, and carried by the end-ofthe lever 36 remote fromthe counterbalance and air foil 38 is a plunger40 which extends longitudinally along the longitudinal axis of the airpassage 30 and mixing chamber 32 and carries at its end remote from thelever 36 acom-pression coil spring 42 on which is seated a conical valvedesignated generally 44.

The conical valve 44, previously referred to, comprises a conical valvebody 46 having an axial recess opening through its larger end to definea turbulence chamber 50, and opening through the inner end of theturbulence into the body 46 is an axial recess 48 to receive the spring42. Carried by the body 46 and extending radial ly outwardly from thelarger end thereof in circumferentially spaced relation are ears 52, andextending'upwardly from the smaller end of the conical body inconcentric spaced relation thereto is a conical valve face 54 whichextends into the valve seat 28 for regulating the flow of fuel throughthe port 18L Carried by and extending longitudinally from the smallerend of the valve body 46 in concentric spaced relation to the conicalvalve member 54 is an annular collar 56 which slidably enters an annulargroove 58 which opens through the duct16 in concentric spaced relationto the port 18 and valve seat 28. The body 46 is provided with anannular row of longitudinally extending circumferentially spaced liquidfuel passages 60 which extend therethrough from the trough 62 definedbetween the conical valve portion 54 and the annular collar 56 to directfuel passing through the port 18 intothe turbulence chamber 50previously referred to. The valve body 46 has inclined'passages' 64extending therethrough which open of and communicate with the passages60 to introduce.

air into the fuel as it passes from the annular trough 62 through thepassages 60 and into the turbulence chamber 50. A compression coiledspring 66 is carried by the duct 16 and'extends-through the port 13 forentrance into a seat 68 formed in the conical valve face 54' of thevalve body 46 to yieldingly urge the valve 44 into open position againstthe effort of the counterbalance and air foil 38.

Secured to the ears '52 and extending upwardly adjacent the sides of thevalve body 46 are converging legs 70 which are connected at their upperends to a crosshead 7 2 upon which is seated a compression coiled spring7 4 which extends axially with relation to the air passage 30 and alignsaxially with an opening '76 formed in a transversely extending cross bar78 carried by the carburetor and extending through the air passage '30.A plunger 80 is mounted to slide through the opening 76 and carries atits upper end a cross pin 82. Pivotally mounted on spaced ears 84carried by the carburetor and extending into the air passage 30 is anarm designated generally '86 comprising a threaded stem '88 on which ismounted for longitudinal adjustment a turnbuckle 90. The coupling pin 82of the plunger 80 extends transversely through an elongated slot 92which opens through the arm 86 and carried on said arm adjacent the endthereof remote from the end which is pivotally connected to the cars 84is an air foil '94. It will thus be seen that air passing through theair passage 30 will act against the air foil 94 to urge is downwardlyand consequently move the plunger 80 against the effort of thecounterbalance and air foil 38 to move the valve 44 open relative to theport 18. In order to stabilize the operation of the valve 44 and avoidthe transmission thereto of inconsequential movements of the air foil'94, a dampening spring 96 is interposed between the cross bar 78 andthe underside of the coupling of the plunger 80 with the arm 86 insurrounding relation to the plunger 80.

In operation, it will be evident that air passing through the air intakepassage 30 toward the mixing chamber 32 will react against the .air foil94 to move the valve 44 away from the port 18 to permit the flow ofextra fuel into the mixing chamber 32 in direct ratio to the velocity:of the air so as to assure the proper mixture of air and fuel in themixing chamber to meet the exact requirements of the engine speed. Thevvalve, of course, is yieldingly held open under the effort of thespring 66 which reacts against the effort of the counterbalance and air.foil 38, and by proper relation between the air foil '94 and the airfoil 38, it will be evident that the valve 44 will be properly balancedrelative to the port 18 to assure the correct supply of fuel enteringthe mixing chamher and at the same time supplying to the engine onlythat amount of fuel required for a selected engine speed. It will thusbe seen that the supply of fuel to the engine is governed solely by theposition of the throttle valve 98 which is disposed between the mixingchamber and the intake manifold of the engine.

From the foregoing, it will be evident that by employing this particularmetering valve on conventional internal combustion engine carburetors,only enough fuel will be supplied to the engine at a selected enginespeed to obtain maximum engine operation, and thus fuel economies willbe experienced.

While in theforegoing there has been shown and described the preferredembodiment of this invention, it is to be understood that minor changesin the details of construction, combination and arrangement of parts maybe resorted to without departing from the spirit and scope of theinvention as claimed.

What is claimed is:

1. -In a carburetor having an air intake passage, a fuel and air mixingchamber communicating with said pas sage, and a liquid fuel inlet portbetween the air intake passage and the mixing chamber, means forpreserving a correct ratio of fuel to. air entering the mixing chamber,said means comprising a valve mounted in the air intake passage adjacentthe port, gravity actuated means mounted within the mix-ing chamber andoperatively connected to the valve for advancing it into closingrelation to the port, and means mounted in the air intake passage andoperatively connected to the valve for moving said valve against theeffort of the gravity actuated means in response to increasing velocityof air passing through said intake passage toward the mixing chamber.

2. In a carburetor having an air intake passage, a fuel and air mixingchamber communicating with said passage, and a liquid fuel inlet portbetween the air intake passage and the mixing chamber, means forpreserving a correct ratio of fuel to air entering the mixing chamber,said means comprising a valve mounted in the air intake passage adjacentthe port, a combination counterbalance and airfoil mounted within themixing chamber and operatively connected to the valve for advancing itinto closing relation to the port, means mounted in the air intakepassage and operatively connected to the valve for moving said valveagain-st the effort of the counterbalance in response to increasingvelocity of air passing through said intake passage toward the mixingchamber, yielding means carried by the carburetor and engaging the valvefor holding said valve open against the effort of the counterbalance andairfoil, and said combination counterbalance and airfoil beingresponsive to increasing velocity of the mixture passing through themixing chamber for moving the valve against the effort of the yieldingmeans.

3. In a carburetor having an air intake passage, a fuel and air mixingchamber communicating with said passage, and a liquid fuel inlet portbetween the air intake passage and the mixing chamber, means forpreserving a correct ratio of fuel to air entering the mixing chamber,said means comprising a valve mounted in the air intake passage adjacentthe port, gravity actuated means mounted within the mixing chamber andoperatively connected to the valve for advancing it into closingrelation to the port, and an airfoil mounted in the .air passage to movetherein toward and away from the mixing chamber and operativelyconnected to the valve for moving said valve against the effort of thegravity actuated means in response to increasing velocity of air passingthrough the air passage.

4. In a carburetor having an air intake passage, a fuel and air mixingchamber communicating with said passage, and a liquid fuel inlet. portbetween the air intake passage and the mixing chamber, means forpreserving a correct ratio of fuel to air entering the mixing chamber,said means comprising a shaft carried by the carburetor and extendingtransversely across the mixing chamber, a lever mounted on the shaft formovement in an arcuate path, a valve carried by the lever for movementthereby into and out of closing relation to the port, 'a spring carriedby the carburetor and engaging the valve for urging it into openrelation to the port, and means carried by the lever within the mixingchamber for moving said valve against the effort of the spring, andmeans within the air passage and operatively connected to the valve foropening it in response to increasing velocity of the mixture passingthrough the mixing chamber.

5. In a carburetor having an air intake passage, a fuel and air mixingchamber communicating with said passage, and a liquid fuel inlet portbetween the air intake passage and the mixing chamber, means forpreserving a correct ratio of fuel to air entering the mixing chamber,said means comprising a shaft carried by the carburetor and extendingtransversely across the mixing chamber, a lever mounted on the shaft formovement in an arcuate path, a valve carried by the lever for movementthereby into and out of closing relation to the port, a spring carriedby the carburetor and engaging the valve for urging it into openrelation to the port, means carried by the lever within the mixingchamher for moving said valve against the effort of the spring inresponse to increasing velocity of the mixture passing through themixing chamber, and means mounted in the intake passage and operativelyconnected to the valve for counteracting the effort of the means carriedby the lever in response to increasing velocity of air passing throughthe air intake passage.

6. In a metering valve for a carburetor a liquid fuel duct having aliquid fuel discharge port opening therethrough adjacent one endthereof, said duct having an annular groove opening therethrough inconcentric spaced relation to the port, an annular guide flange mountedin. said groove, a cone-shaped valve body carried by the 'guide flangeand defining therewith an annular trough,

said valve body having liquid fuel discharge passages extendingtherethrough and communicating with the trough, yielding means carriedby the duct and engaging said valve, body for moving it into openposition relative to the port, and a counterbalance mounted adjacent oneside of the liquid fuel duct and operatively connected to the valve bodyfor advancing it toward the duct against the effort of the yieldingmeans.

7. In a metering valve for a carburetor a liquid fuel duct having aliquid fuel discharge port opening therethrough adjacent one endthereof, said duct having an annular groove opening therethrough inconcentric spaced relation to the port, an annular guide flange mountedin said groove, a cone-shaped valve body carried by the guide flange formovement toward and away from said port, said valve body having liquidfuel discharge passages extending therethrough, yielding means carriedby the duct and engaging said valve body for moving it into openposition relative to the port, a counterbalance mounted adjacent oneside of the liquid fuel duct and operatively connected to the valve bodyfor advancing it toward the duct against the effort of the yieldingmeans, an air foilmounted adjacent the side of the duct remote from thecounterbalance and operatively connected to the valve for moving saidvalve in response to increasing velocity of air passing said air foil,and

said valve body having air passages extending therethrough.

References Cited in the file of this patent UNITED STATES PATENTS699,309 Hamilton 'May 6, 1902 1,222,688 Shipman Apr. 17, 1917 1,249,381Haas Dec. 11, 1917 1,258,881 Donning Mar. 12, 1918 1,405,777 Good Feb;7, 1922

